When a sound is moving toward the observer the observer will hear a higher pitch. this is due to

The answer is The Doppler Effect.  It is named after the Austrian physicist Christian Doppler, who described the phenomenon in 1842.

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion

a. seed plant structure. 1. the three main plant organs are roots, stems, and leaves. a fourth kind of tissue, meristematic tissue, is responsible for plant growth. meristematic tissue is the only plant tissue that produces new cells by mitosis. plants can lose water out of their leaves as they exchange gases with the air

explanation: